.page{
    width: 100%;
    color: #333;
}
.todo{
    position: relative;
    display: flex;
    align-items: center;
    border-top: 1px solid #ddd;
    line-height: 50px;
    input{
        width: 20px;
        height: 20px;
        margin-right: 10px;
    }
    label{
        flex: 1;
    }
    input:checked + label{
        text-decoration: line-through;
    }
    button{
        position: absolute;
        right: 10px;
        top: 50%;
        width: 20px;
        height: 20px;
        transform: translateY(-50%);
        text-align: center;
        appearance: none;
        background: none;
        border:none;
        cursor: pointer;
        display: none;
    }
    &:hover > button{
        display: block;
    }
}